Sol-gel synthesis, characterization, and catalytic properties of Ni, Cd, Co, and Fe oxides recycled from spent Ni-Cd batteries using citric acid as a leaching agent

This research developed a sustainable, green, hydrometallurgical route for recycling the positive electrodes of Ni-Cd batteries using citric acid as a leaching agent. The mixed oxide was synthesized using a gel precursor that was calcinated at 400 °C for 2 h. The mixed composition of the metal oxide...

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